CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 8,203	$ 5,364
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	30,850	28,512
Amortization of intangible assets	3,239	3,370
Loss (gain) on sale of property and equipment	(2,293)	(24)
Stock-based compensation expense	710	524
Changes in assets and liabilities:
Customer retention deposits and restricted cash	(435)	(904)
Accounts receivable	2,514	21,603
Costs and estimated earnings in excess of billings	(17,151)	(40,581)
Other current assets	2,708	(6,726)
Other long-term assets	(747)	(1,800)
Accounts payable	(11,065)	356
Billings in excess of costs and estimated earnings	(17,584)	(21,318)
Contingent earnout liabilities		(4,910)
Accrued expenses and other current liabilities	7,337	3,820
Other long-term liabilities	(788)	(4,547)
Net cash provided by (used in) operating activities	5,498	(17,261)
Cash flows from investing activities:
Purchase of property and equipment	(42,140)	(35,674)
Proceeds from sale of property and equipment	5,723	3,602
Sale of short-term investments		30,992
Cash paid for acquisitions	(4,108)	(22,302)
Net cash used in investing activities	(40,525)	(23,382)
Cash flows from financing activities:
Proceeds from issuance of long-term debt		11,000
Repayment of capital leases	(468)	(714)
Repayment of long-term debt	(24,262)	(20,635)
Proceeds from issuance of common stock purchased by management under long-term incentive plan	1,439	1,621
Dividends paid	(5,689)	(4,124)
Net cash used in financing activities	(28,980)	(12,852)
Net change in cash and cash equivalents	(64,007)	(53,495)
Cash and cash equivalents at beginning of year	161,122	139,465
Cash and cash equivalents at end of the year	97,115	85,970
Cash paid during the period for:
Interest	4,412	3,588
Income taxes, net of refunds received	1,299	5,645
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared and not yet paid	$ 2,847	$ 2,841